102340421 has 2 divisors, whose sum is σ = 102340422. Its totient is φ = 102340420.

The previous prime is 102340417. The next prime is 102340457. The reversal of 102340421 is 124043201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80820100 + 21520321 = 8990^2 + 4639^2 .

It is a cyclic number.

It is not a de Polignac number, because 102340421 - 2² = 102340417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102340421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102340321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51170210 + 51170211.

It is an arithmetic number, because the mean of its divisors is an integer number (51170211).

Almost surely, 2^102340421 is an apocalyptic number.

It is an amenable number.

102340421 is a deficient number, since it is larger than the sum of its proper divisors (1).

102340421 is an equidigital number, since it uses as much as digits as its factorization.

102340421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 102340421 is about 10116.3442507657. The cubic root of 102340421 is about 467.7520861086.

Adding to 102340421 its reverse (124043201), we get a palindrome (226383622).

The spelling of 102340421 in words is "one hundred two million, three hundred forty thousand, four hundred twenty-one".